<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist"
        bordr
        stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- <pre>{{scope.row}}</pre> -->
            <el-row :class="['bdbottom',i1 === 0?'bdtop':'','cvcenter']"
              v-for="(item1,i1) in scope.row.children"
              :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable
                  @close="removeRightById(scope.row,item1.id)"> {{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级、三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染 -->
                <el-row :class="[i2 === 0?'':'bdtop','cvcenter']"
                  v-for="(item2,i2) in item1.children"
                  :key="item2.id">
                  <!-- 左侧二级 -->
                  <el-col :span="6">
                    <el-tag type="success"
                      closable
                      @close="removeRightById(scope.row,item2.id)">
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 右侧三级 -->
                  <el-col :span="18">
                    <el-tag type="warning"
                      closable
                      v-for="(item3) in item2.children"
                      :key="item3.id"
                      @close="removeRightById(scope.row,item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>>
        </el-table-column>
        <el-table-column type="index"
          label="ID">
        </el-table-column>
        <el-table-column label="角色名称"
          prop="roleName"></el-table-column>
        <el-table-column label="角色描述"
          prop="roleDesc"></el-table-column>
        <el-table-column label="操作"
          width="300px">
          <template slot-scope="scope">
            <el-button size="mini"
              type="primary"
              icon="el-icon-edit">
              编辑
            </el-button>
            <el-button size="mini"
              type="danger"
              icon="el-icon-delete">
              删除
            </el-button>
            <el-button size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)">
              分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="30%"
      @close="setRightDialogClosed">

      <!-- 树形控件 -->
      <el-tree :data="rightslist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defkeys"
        ref="treeRef">
      </el-tree>

      <span slot="footer"
        class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary"
          @click="allowRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 所有用户角色列表
      rolelist: [],
      // 控制分配权限的对话框
      setRightDialogVisible: false,
      // 所有权限数据
      rightslist: [],
      // 树形控件的绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认选中的节点ID值数组
      defkeys: [],
      // 当前即将分配角色的角色ID
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取用户角色失败')
      }
      this.rolelist = res.data
    },
    // 根据ID删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示
      const confirmRes = await this.$confirm('此操作永久删除用户权限，是否继续?', '删除权限', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmRes !== 'confirm') {
        return this.$message.info('取消删除')
      }
      // 删除权限
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      // 重新赋值
      role.children = res.data
      this.$message.success('删除权限成功')
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      // 保存用户角色ID
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取失败')
      }
      this.rightslist = res.data
      // 递归获取三级权限的ID
      this.getLeafKeys(role, this.defkeys)
      this.setRightDialogVisible = true
    },
    /* 通过递归的方式，获取角色下三级权限的id,并保存到defkeys数组中 */
    getLeafKeys (node, arr) {
      // 三级权限是不包含childern的
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      // 关闭之后需要初始化默认选中的节点ID值数组
      this.defkeys = []
    },
    // 点击为角色分配权限
    async allowRights () {
      /*
        1、通过elementUI的tree控件里面的getCheckedKeys()方法获取选中的节点
        getHalfCheckedKeys()方法获取半选的节点
        2、通过...(模板字符串)将数组转化为一下=>[105,125]
        3、通过join(',')转化为以英文逗号隔开的字符串
      */
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配角色权限失败！')
      }
      this.$message.success('分配角色成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>
<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.cvcenter {
  display: flex;
  align-items: center;
}
</style>
